Fire-bed and tuyere



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' F. M. ROOTS.

FIRE BED AND TUYERE.

No. 349,363. Patented Sept. 21, .1886.

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N. PETERS. PboYwLilMg UNITE STATES PATENT OFFICE.

FRANCIS M. ROOTS, OF CONNERSVILLE, INDIANA.

FIRE-BED AND TUYERE.

SPECIFICATION forming part of Letters Patent No. 349,363, dated September 21, 1886. Application filed January 19, 1866. Serial No. 159,059. (No model.)

2'0 all whom it may concern:

Be it known that I, FRANCIS M. ROOTS, a citizen of the United States, and a resident of Oonnersville, in the county of Fayette and State of Indiana, have invented a certainnew and useful Improvement in Fire-Beds and Tuyeres, of which the following is a specification.

My invention is an improved blacksmiths fire-bed and tuyere.

Its object is to so construct and combine the parts that they will be free to expand and contract separately in use, and thus prevent warping and cracking.

Its object also is to provide for changing the bottom of the fire-bed, so that the same body or bed may be used for converging or diffusing the heat,according to the character of work to be done, and also to avoid drilling holes in the bottom of the bed for the blast to pass from the air-chamber to the fire.

Another object is to strengthen the'wall of the fire-bed at the point where it is subjected to the greatest heat, and lighten it at the points farther removed from the heat, so that a durable fire bed is obtained at a comparatively light expense.

Its final object is to provide a downwardlyprojecting flange around the fire-bed, so that it requires but little labor to set it in place, the space between the flange and the fire-bed forming a chamber through which a constant circulation of air will pass through perforations in the top of the bed, and this keeps the fire-bed comparatively cool.

The invention will be first fully described in connection with the accompanying drawings, and particularly referred to and pointed out in the claims.

Referringto the drawings,in which like parts are represented by similar reference-letters wherever they occur, Figure 1 is a plan view of a fire-bed embodying my invention. Fig. 2 is a central vertical'section taken through line as a; of Fig. 1. Fig. 3 is a diametrical section, on an enlarged scale, of the two-part bottom of the fire-bed, the parts in this view being shown detached one above the other. Fig. 4 is a plan view of the ring which is shown in section at the top of the view Fig. 3. Fig. 5 is a plan view of the part shown in section in the lower view of Fig. 3.

The whole of the fire-bed, tuyere, and blastpipe,with theexception of the lower gate and the parts represented in Figs. 3, 4, and 5, is cast in a single piece.

A is the fire-bed proper. It has its wall thickened at a,where it is subjected to the greatest heat, to prevent its being burned out. At the bottom of the fire-bed is a countersunk depression, terminating in a shoulder or offset at a, to receive a'separate perforated piece, B. This piece B has a central projection, b,on the upper side, and a depression, I), 011 the under side beneath it. It is also cast with perforations 1) and b ,which taper from the under side to the top. The ring 0, which rests upon the flange of the piece 13, hasitsinner wallinclined from the bottom to the top, so that the inclination on all sides converges toward the center. The object of this arrangement is to keep the fire from spreading and concentrate the heat to the center of the fire-bed. For most purposes this is desirable; but for some work it is desirable to have the blast diffused. When such is the case, a ring having its inner wall diverging in the opposite direction or flaring from the bottom up can be substituted for the ring 0. It is intended that the rings Gand B fit loosely upon each other and within the bottom of the bed A, so as to admit of the parts expanding or contracting under different temperatures to which they are subjected without liability of cracking or warping. This arrangement of detachable fire-bottom permits the introduction of different sets of bottom pieces, so that the passage of the blast may be directed in any desired formfor instance, the openings in one set may be elongated and the sides narrowed so as to take a long heat, and another set may be arranged to take a circular or semicircular heat-so that one fire-bed may be adapted to all the various uses by simply changing the bottom as occasion requires. Around the outer edge of the fire-bed is a downwardly-projecting flange, D. The lower edge of this is in the same horizontal plane, so that it sets level on any true surface. Around the edge of the fire-bed are perforations 0. to permit the hot air from within the chamber formed by the flange D to pass, thus causing a constant circulation around the fire-bed A, which keeps the fire-bed comparatively cool.

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E is the gate or valve to discharge the ashes or dbris from the air-chamber F. I

G is the tuyere or inlet-pipe conducting the air from the blower or bellows into the airehalnber F of the fire-bed.

\Vhat I claim is i. Ametallic fire-bed for blacksmiths,of the form shown, and having its wall thickened at a, for the purpose set forth.

2. A metallic fire-bed of the character described, having its body cast in a single piece, and having the downwardly-projecting flange D surrounding said body to support thesame.

3. A metallic fire-bed of the character described, having its body cast in a single piece, and having a laterally-projecting flange perforated at a and a downwardly-projecting flange, l), surrounding said body, and, when the device is set for use, forming an air-chamber around the same for the purpose of keep- 20 ing the bed cool, substantially as specified.

4. In a blacksmiths fire-bed, the combination of the bed A and tuyere F, cast in one piece, and having an ofi'set,a, between thetwo, with the perforated plate B, constructed to rest 25 loosely within said offset, and the ring 0, to rest upon said plate within the body A, for the purpose set forth.

FRANCIS M. ROOTS.

Witnesses:

GEo. J. MURRAY, EDGAR OHAIR. 

